package DataStructure.linkedlist;

public class ListNode {
     public  int val;
     public  ListNode next;
     public ListNode pre;
     public ListNode(){};
     public ListNode(int val){
            this.val = val;
        }
     public ListNode(int val, ListNode next) { this.val = val; this.next = next; }
     public ListNode(int val,ListNode pre,ListNode next){
         this.val = val;
         this.pre = pre;
         this.next = next;
     }
}
